«Molasse de l'Helvétien»

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Representation and status

Color CMYK
N/A
Color RGB
R: 125 G: 125 B: 125
Rank
lithostratigraphic Supergroup
Validity
Unit is not in Use
Status
obsolete term (disused)

Nomenclature

Deutsch
«Molasse des Helvétien
Français
«Molasse de l'Helvétien»
Italiano
«Helvetiano»
English
«Helvetian Molasse»
Origin of the Name

Named after the disused Helvetian stage (Middle Miocene).

Historical Variants

37e Etage = Helvétien = Grès coquillier = Muschelsandstein (Greppin 1866), Helvétien auct. (Rutsch 1933), Helvétien = oberer Teil der OMM (Gerber & Wanner 1984), Helvetian facies (Schoepfer & Berger 1989)

Description

Description

Ancien terme à connotation chronostratigraphique désignant la Molasse marine supérieure (OMM).

Components

Fossil Content
  • ostreids

grosse Austern (Ostrea gryphoides Schlotheim)

Hierarchy and sequence

Age

Age at top
  • Langhian
Age at base
  • late Burdigalian

Palaenography and tectonic

  • Upper Marine Molasse
Tectonic unit (resp. main category)
Kind of protolith
  • sedimentary
Metamorphism
non metamorphic

References

Definition
Schoepfer Pascal, Berger Jean-Pierre (1989) : «Burdigalian» and «Helvetian» in Western Switzerland. Geol. Carpathica 40, 17–21

p.17: The upper part of the OMM, corresponding to the so-called "Helvetian facies", is represented by conglomerates, sandstones and marls laid down under fluvial, gravity, tidal and wave control. This series is characterised by the development of fan deltas (Schoepfer 1987) and interfan areas on the southern margin of the molassic foreland basin.

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